It is difficult to say. It is not hunger. We may have no sensation of hunger at all and yet find an appetite when we see a tempting dish before us. Makes our mouth water is a common saying about nice food. Perhaps that’s the secret.
If the juices are ready in the mouth and the stomach, then appetite comes. So daintiness counts. God-given food must be served at its best; every meal served so that it may be an offering to the giver of all good things. Then appetite will wait on digestion and digestion on appetite and the work of the cook will be the best work in the world!